(3x+3)(x^2+x)<0
    x-2＞68
    -5x+2＞0
    x^2>8
    1/(x-4)<1 - x/(4-x)
    1/(x-4)<1 - (x/4-x)
    1/x-4<1 - (x/4-x)
    n(n+1)(2n+1）/6<385
    -18+22×e^（-10x）＞0
    （（x^2)-x-5)^2-（2x-1)^2＞0
    x≤9
    ax＾2+ax+1≥0
    -2＜sqrt(a^2-3a+2)-a<2
    sqrt(a^2-3a+2)+a＞2
    0
    x^2-3absx+2>0
    abs(2x-1)+abs(x-3)>=5
    abs(x-1)+abs(x-3)>2
    abs(x-1)+abs(x-3)<2
    5X-3X^2-2 >0

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